§ 401-10. Existing assemblies.

All presently installed backflow-prevention assemblies that do not meet the requirements of this chapter but were approved assemblies for the purpose described herein at the time of installation and that have been properly maintained shall, except for the inspection and maintenance requirements under § 401-9, be excluded from the requirements of these rules so long as the Water Superintendent is assured that they will satisfactorily protect the utility system. Whenever the existing assembly is moved from the present location or requires more than minimum maintenance or when the Water Superintendent finds that the maintenance constitutes a hazard to health, the unit shall be replaced by an approved backflow-prevention assembly meeting the requirements of this chapter.